-- @owner: opentestcase013
-- @date: 2023/8/3
-- @testpoint: LIST分区表，非压缩表改为压缩表

--step1:建LIST分区表并插入数据;expect:成功
drop table if exists t_alter_rowcompress_0020 cascade;
create table t_alter_rowcompress_0020 (col1 int, col2 int)
partition by list(col1)
(
partition t_alter_rowcompress_0020_01 values (2000),
partition t_alter_rowcompress_0020_02 values (3000),
partition t_alter_rowcompress_0020_03 values (4000),
partition t_alter_rowcompress_0020_04 values (5000)
);

insert into t_alter_rowcompress_0020 values(2000, generate_series(0, 200));
insert into t_alter_rowcompress_0020 values(3000, generate_series(0, 300));
insert into t_alter_rowcompress_0020 values(4000, generate_series(0, 400));
insert into t_alter_rowcompress_0020 values(5000, generate_series(0, 500));

--step2:查看表文件占用磁盘大小，数据校验;expect:成功
select pg_size_pretty(pg_total_relation_size('t_alter_rowcompress_0020')) as table_size;
select checksum(t_alter_rowcompress_0020::text) from t_alter_rowcompress_0020;

--step3:修改表为压缩表，checkpoint;expect:成功
alter table t_alter_rowcompress_0020 set (compresstype = 1);
checkpoint;

--step4:再次查看表文件占用磁盘大小、数据校验;expect:表文件磁盘占用小于非压缩表，数据一致
select pg_size_pretty(pg_total_relation_size('t_alter_rowcompress_0020')) as table_size;
select checksum(t_alter_rowcompress_0020::text) from t_alter_rowcompress_0020;

--step5:查看压缩率;expect:成功
drop function if exists compress_func_findpath(character varying);
create or replace function compress_func_findpath(character varying)
returns character varying
language plpgsql
as
$body$
declare
relpath character varying;
begin
relpath = (select pg_relation_filepath(relname::regclass) from pg_class where relname = $1);
return relpath;
end;
$body$;
/

select is_compress, file_count, logic_size, physic_size, compress_ratio from pg_catalog.compress_ratio_info(compress_func_findpath('t_alter_rowcompress_0020'));

--step6:查看分区表信息;expect:成功
select relname, reloptions from pg_partition order by relname;

--step7:清理环境;expect:成功
drop table if exists t_alter_rowcompress_0020;
drop function if exists compress_func_findpath(character varying);